Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method of wireless communication, comprising: receiving data symbols for transmission over a wireless communication channel using multiple antenna ports; generating a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports; mapping, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence; multiplexing a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal comprising an OFDM symbol; and transmitting the output signal over a wireless communication channel, wherein the generating the plurality of scrambling sequences comprises: using a pseudorandom number generator to generate a pseudorandom sequence, generating a plurality of circular shifts based on evenly dividing a length of the OFDM symbol, and generating each of the plurality of scrambling sequences by performing a circular shift operation on the pseudorandom sequence using each of the plurality of circular shifts for the each antenna port.
2. The method of claim 1 , wherein the circular shift operation is performed in a time domain.
A method for processing signals involves performing a circular shift operation in the time domain to manipulate signal data. The technique is particularly useful in digital signal processing (DSP) applications where time-domain operations are preferred for efficiency or compatibility with other processing steps. The circular shift operation allows for the reordering of signal samples in a periodic manner, which can be critical for tasks such as synchronization, filtering, or modulation. By performing this operation in the time domain, the method avoids the computational overhead of transforming between time and frequency domains, making it suitable for real-time or resource-constrained systems. The method may be applied to various types of signals, including audio, communication signals, or sensor data, where precise timing and phase alignment are important. The circular shift can be implemented using hardware accelerators, software algorithms, or a combination of both, depending on the application requirements. This approach ensures that the signal processing pipeline remains efficient while maintaining the integrity of the time-domain characteristics of the signal. The method is particularly valuable in systems where latency and processing power are critical constraints.
3. The method of claim 1 , wherein the circular shift operation is performed by modulating the scrambling sequence by a complex exponential in the frequency domain.
This invention relates to wireless communication systems, specifically to techniques for improving signal processing efficiency in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is the computational complexity associated with circular shift operations in OFDM, which are often used for scrambling or synchronization purposes. Traditional methods require time-domain processing, which can be computationally intensive. The invention describes a method for performing a circular shift operation in the frequency domain by modulating a scrambling sequence with a complex exponential. The scrambling sequence is a pseudo-random or deterministic sequence applied to OFDM symbols to reduce interference or improve synchronization. Instead of performing the shift in the time domain, the method applies a phase rotation in the frequency domain, which is computationally more efficient. This approach leverages the properties of the discrete Fourier transform (DFT) to simplify the operation, reducing the number of required multiplications and additions. The method involves generating a scrambling sequence, transforming it into the frequency domain, and then applying a complex exponential modulation to achieve the desired circular shift. The complex exponential introduces a linear phase shift across the frequency bins, which corresponds to a circular shift in the time domain. This technique is particularly useful in OFDM systems where frequency-domain processing is already performed for modulation and demodulation, allowing for seamless integration into existing signal processing pipelines. The result is a more efficient implementation of circular shifts, reducing computational overhead while maintaining signal integrity.
4. The method of claim 1 , further including: generating orthogonal codes, wherein the mapping includes using the corresponding scrambling sequence and one of the orthogonal codes for mapping pilot signals to time-frequency transmission resources.
This invention relates to wireless communication systems, specifically to techniques for mapping pilot signals to time-frequency transmission resources using orthogonal codes and scrambling sequences. The problem addressed is efficient and reliable pilot signal transmission in wireless networks, which is critical for channel estimation, synchronization, and other essential functions. The invention improves upon prior methods by enhancing the mapping process to reduce interference and improve signal detection accuracy. The method involves generating orthogonal codes, which are sequences with low cross-correlation properties, ensuring that different pilot signals can be transmitted simultaneously without significant interference. These orthogonal codes are combined with scrambling sequences, which are pseudo-random sequences used to further distinguish between different transmissions and reduce interference. The mapping process assigns pilot signals to specific time-frequency resources in the transmission grid by applying both the scrambling sequence and one of the orthogonal codes. This dual-layer approach ensures that pilot signals are uniquely identifiable and minimizes collisions or interference with other signals in the system. By using orthogonal codes in conjunction with scrambling sequences, the invention provides a more robust and flexible pilot signal mapping scheme. This is particularly useful in dense wireless networks where multiple devices may be transmitting simultaneously, as it helps maintain signal integrity and improves overall system performance. The technique can be applied in various wireless communication standards, including 5G and beyond, to enhance pilot signal transmission efficiency.
5. The method of claim 1 , wherein a different modulated version of a same scrambling sequence is used for each antenna port.
A method for wireless communication involves transmitting signals using multiple antenna ports, where each antenna port employs a distinct modulated version of the same scrambling sequence. This approach enhances signal differentiation and reduces interference between signals transmitted from different antennas. The scrambling sequence is a pseudo-random or deterministic sequence used to spread or encode data, improving signal robustness and security. By applying different modulated versions of the same sequence to each antenna port, the system ensures that signals from different ports remain distinguishable at the receiver, even in multi-antenna configurations. This technique is particularly useful in wireless communication systems, such as cellular networks or Wi-Fi, where multiple antennas are used to improve coverage, capacity, or reliability. The method helps mitigate interference and improve signal quality, especially in environments with high user density or complex multipath propagation. The use of a common scrambling sequence with different modulations ensures synchronization and compatibility across the system while maintaining signal integrity. This approach is applicable in both uplink and downlink transmissions, supporting advanced features like beamforming, spatial multiplexing, or diversity transmission.
6. The method of claim 1 , wherein the first input from the data symbols comprises forward error correction coded and modulated data bits.
This invention relates to data transmission systems, specifically methods for processing data symbols in communication networks. The problem addressed is improving the reliability and efficiency of data transmission by optimizing the handling of encoded and modulated data bits. The method involves receiving a first input of data symbols, where these symbols include forward error correction (FEC) coded and modulated data bits. The FEC coding ensures that transmitted data can be corrected at the receiver if errors occur during transmission, while modulation converts the coded bits into a format suitable for transmission over a communication channel. The method further processes these symbols to enhance data integrity and transmission performance. By incorporating FEC and modulation, the system reduces errors and improves the robustness of data communication. This approach is particularly useful in wireless and high-speed wired networks where signal integrity is critical. The method ensures that data is accurately reconstructed at the receiver, even in the presence of noise or interference. The invention focuses on optimizing the handling of encoded and modulated data to achieve reliable and efficient data transmission.
7. The method of claim 1 , further including mapping to shared time-frequency transmission resources being performed by different user equipment.
This invention relates to wireless communication systems, specifically methods for managing shared time-frequency transmission resources among multiple user equipment (UE) devices. The problem addressed is the efficient allocation and utilization of shared communication resources in a network where multiple devices need to transmit data simultaneously without causing interference. The method involves a process where different user equipment devices map their transmissions to shared time-frequency resources. This mapping is coordinated to ensure that transmissions from different devices do not overlap in time or frequency, thereby minimizing interference and maximizing spectral efficiency. The shared resources are dynamically allocated based on the communication needs of the devices, allowing for flexible and adaptive resource management. The method also includes determining the transmission parameters for each UE, such as modulation and coding schemes, to optimize data throughput and reliability. By coordinating the mapping of transmissions across multiple UEs, the system ensures that each device can access the shared resources without conflicts, improving overall network performance. The approach is particularly useful in scenarios with high device density, such as in 5G and beyond networks, where efficient resource allocation is critical for supporting diverse communication requirements.
8. A wireless communication device comprising a memory storing instruction and a processor, wherein the instructions, when executed by the processor, cause the processor to implement a method comprising: receiving data symbols for transmission over a wireless communication channel using multiple antenna ports; generating a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports; mapping, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence; multiplexing a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal; and transmitting the output signal over a wireless communication channel, wherein the generating the plurality of scrambling sequences includes using a different pseudorandom number generator to generate a pseudorandom sequence for each antenna port.
This invention relates to wireless communication systems, specifically improving signal transmission reliability and interference mitigation in multi-antenna configurations. The problem addressed is the need for efficient pilot signal transmission and data symbol multiplexing in wireless devices using multiple antenna ports to enhance communication performance. The wireless communication device includes a memory storing instructions and a processor executing those instructions. The device receives data symbols for transmission over a wireless channel using multiple antenna ports. For each antenna port, the device generates a unique scrambling sequence using a separate pseudorandom number generator, ensuring distinct sequences per port. Each antenna port maps a corresponding pilot signal to specific time and frequency transmission resources using its assigned scrambling sequence. The device then multiplexes the data symbols and the mapped pilot signals to produce an output signal, which is transmitted over the wireless channel. The use of different pseudorandom number generators for each antenna port ensures orthogonal or low-interference pilot signals, improving channel estimation accuracy and overall communication reliability in multi-antenna systems. This approach enhances signal integrity and reduces interference in dense wireless environments.
9. The device of claim 8 , wherein the method further comprises: generating orthogonal codes, wherein the mapping includes using the corresponding scrambling sequence and one of the orthogonal codes for mapping pilot signals to time-frequency transmission resources.
This invention relates to wireless communication systems, specifically improving pilot signal transmission efficiency in multi-user environments. The problem addressed is the interference and resource allocation challenges when multiple users share the same time-frequency resources for pilot signals, which are critical for channel estimation and synchronization. The solution involves generating orthogonal codes and using them in combination with scrambling sequences to map pilot signals to specific time-frequency transmission resources. This approach ensures that pilot signals from different users are distinguishable and minimizes interference. The orthogonal codes provide additional separation beyond the scrambling sequences, allowing more users to share the same resources without significant performance degradation. The method is particularly useful in systems like 5G and beyond, where efficient pilot signal transmission is essential for supporting high user densities and advanced features like beamforming and massive MIMO. By combining scrambling sequences with orthogonal codes, the invention enables better resource utilization and improved channel estimation accuracy, leading to more reliable communication links.
10. The device of claim 8 , wherein a different modulated version of a same scrambling sequence is used for each antenna port.
A wireless communication system uses multiple antenna ports to improve signal transmission and reception. However, interference between signals transmitted from different antenna ports can degrade performance. To mitigate this, a device employs a scrambling sequence to distinguish signals from different antenna ports. The scrambling sequence is modulated differently for each antenna port, ensuring that signals from different ports remain orthogonal or at least minimally interfere with each other. This approach enhances signal clarity and reliability in multi-antenna systems, particularly in environments with high interference or multipath effects. The device may include a transmitter configured to apply the modulated scrambling sequences to signals before transmission, and a receiver configured to demodulate the received signals using the corresponding sequences. The modulation of the scrambling sequence may involve phase shifting, frequency shifting, or other techniques to create distinct versions for each antenna port. This method improves signal separation and reduces interference, leading to better overall system performance. The technique is applicable in various wireless standards, including 5G and beyond, where multi-antenna configurations are common.
11. The device of claim 8 , wherein the first input from the data symbols comprises forward error correction coded and modulated data bits.
A system for processing data symbols includes a receiver configured to receive a first input comprising forward error correction (FEC) coded and modulated data bits. The system further includes a demodulator that demodulates the received data bits and a decoder that decodes the demodulated data using FEC techniques to correct errors introduced during transmission. The system may also include a second input for receiving additional data symbols, which may be processed similarly or differently depending on the application. The FEC coding ensures reliable data recovery by detecting and correcting errors, improving communication robustness in noisy or interference-prone environments. The system may be part of a wireless communication device, a storage system, or any other application requiring error-resistant data transmission. The FEC coding scheme may include techniques such as Reed-Solomon, convolutional codes, or low-density parity-check (LDPC) codes, while modulation schemes may include phase-shift keying (PSK), quadrature amplitude modulation (QAM), or other digital modulation methods. The system optimizes data integrity by combining error correction with modulation to enhance signal reliability.
12. The device of claim 8 , further including mapping to shared time-frequency transmission resources being performed by different user equipment.
This invention relates to wireless communication systems, specifically to methods for managing shared time-frequency transmission resources among multiple user equipment (UE) devices. The problem addressed is efficient resource allocation in wireless networks where multiple devices need to share limited transmission resources without causing interference or collisions. The device includes a processor configured to allocate shared time-frequency transmission resources to multiple user equipment (UE) devices. The allocation is performed in a way that ensures different UEs can use the same or overlapping time-frequency resources without interference. The system may involve techniques such as scheduling, beamforming, or spatial multiplexing to enable simultaneous transmissions. The device may also include a transceiver for communicating with the UEs and a memory for storing resource allocation data. The invention further includes a method for mapping UEs to shared time-frequency resources, where different UEs are assigned to the same or overlapping resources based on their transmission requirements and network conditions. This mapping may be dynamic, adjusting in real-time to changes in network load or UE mobility. The system may also include error detection and correction mechanisms to handle transmission errors caused by resource sharing. The overall goal is to improve spectral efficiency and reduce latency in wireless networks by allowing multiple UEs to share transmission resources effectively. This is particularly useful in dense network environments where resource contention is high.
13. A wireless signal transmission apparatus comprising a processor, configured to: receive data symbols for transmission over a wireless communication channel using multiple antenna ports; generate a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports; map, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence; multiplex a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal; and cause a transmission of the output signal over a wireless communication channel, wherein generating the plurality of scrambling sequences comprises: using a pseudorandom number generator to generate a pseudorandom sequence, generating a plurality of circular shifts based on evenly dividing a length of the OFDM symbol, and generating each of the plurality of scrambling sequences by performing a circular shift operation on the pseudorandom sequence using each of the plurality of circular shifts for the each antenna port.
This invention relates to wireless signal transmission, specifically improving pilot signal mapping in multi-antenna systems. The problem addressed is efficient pilot signal transmission in wireless communication channels using multiple antenna ports, where maintaining orthogonality and minimizing interference between pilot signals is critical. The apparatus includes a processor that receives data symbols for transmission over a wireless communication channel using multiple antenna ports. The processor generates multiple scrambling sequences, each corresponding to one of the antenna ports. For each antenna port, a corresponding pilot signal is mapped to time and frequency transmission resources using the assigned scrambling sequence. The data symbols and the mapped pilot signals are multiplexed to generate an output signal, which is transmitted over the wireless communication channel. The scrambling sequences are generated by first producing a pseudorandom sequence using a pseudorandom number generator. The length of the OFDM symbol is evenly divided to create multiple circular shifts. Each scrambling sequence is then generated by applying a circular shift operation to the pseudorandom sequence, with each antenna port receiving a distinct circular shift. This method ensures that pilot signals from different antenna ports are orthogonal, reducing interference and improving signal quality in multi-antenna wireless transmissions.
14. The apparatus of claim 13 , wherein the circular shift operation is performed in a time domain.
This invention relates to signal processing systems, specifically apparatuses for performing circular shift operations on signals. The problem addressed is the computational inefficiency and complexity of performing circular shifts in the frequency domain, which often requires additional transformations and processing steps. The invention provides an apparatus that performs circular shift operations directly in the time domain, reducing computational overhead and improving processing efficiency. The apparatus includes a signal input module configured to receive an input signal, a time-domain processing module that performs the circular shift operation on the input signal in the time domain, and an output module that provides the shifted signal. The time-domain processing module may include a buffer or memory to store the input signal and a shift controller to manage the circular shift operation, ensuring that the signal is rotated without data loss or distortion. The apparatus may also include additional modules for signal conditioning, such as filtering or normalization, to prepare the signal for the circular shift operation. By performing the circular shift in the time domain, the apparatus avoids the need for frequency-domain transformations, such as Fast Fourier Transforms (FFTs), which are computationally intensive. This approach simplifies the hardware and software implementation, making the apparatus suitable for real-time applications where low latency and high efficiency are critical. The invention is particularly useful in digital signal processing (DSP) systems, communications systems, and audio processing applications.
15. The apparatus of claim 13 , wherein the circular shift operation is performed by modulating the scrambling sequence by a complex exponential in the frequency domain.
This invention relates to wireless communication systems, specifically improving signal processing in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is the need for efficient scrambling and circular shift operations in the frequency domain to enhance signal integrity and reduce interference. The apparatus includes a scrambling module that applies a scrambling sequence to an OFDM signal in the frequency domain. A circular shift operation is then performed by modulating the scrambled sequence with a complex exponential function. This modulation adjusts the phase of the frequency-domain signal, effectively shifting its position in the time domain without altering its spectral properties. The complex exponential modulation ensures precise control over the shift, which is critical for synchronization and interference mitigation in multi-user or multi-antenna systems. The scrambling sequence is designed to spread energy uniformly across the frequency domain, reducing peak-to-average power ratio (PAPR) and improving resistance to multipath fading. The circular shift operation, when applied in conjunction with scrambling, allows for flexible signal alignment and interference cancellation, particularly in scenarios involving multiple access techniques or beamforming. The apparatus may also include a transformation module to convert the processed signal between time and frequency domains, ensuring compatibility with OFDM modulation and demodulation processes. The overall system enhances signal robustness and spectral efficiency in wireless communication networks.
16. The apparatus of claim 13 , wherein the processor is further configured to: generate orthogonal codes, wherein the mapping includes using the corresponding scrambling sequence and one of the orthogonal codes for mapping pilot signals to time-frequency transmission resources.
This invention relates to wireless communication systems, specifically to techniques for mapping pilot signals to time-frequency transmission resources in a multi-user environment. The problem addressed is the efficient and interference-resistant allocation of pilot signals in wireless networks, particularly in scenarios where multiple users share the same frequency resources. The apparatus includes a processor configured to generate orthogonal codes and use them in conjunction with scrambling sequences to map pilot signals to specific time-frequency transmission resources. The orthogonal codes ensure that pilot signals from different users do not interfere with each other, while the scrambling sequences provide additional differentiation between users. This dual-layer mapping approach improves signal detection accuracy and reduces interference in multi-user wireless communication systems. The processor is also configured to assign pilot signals to users based on their respective scrambling sequences and orthogonal codes, ensuring that each user's pilot signals are uniquely identifiable. The orthogonal codes are generated to be mutually orthogonal, meaning they have minimal cross-correlation, which further enhances the reliability of pilot signal detection. The scrambling sequences are user-specific, allowing the system to distinguish between different users even when they share the same time-frequency resources. This technique is particularly useful in wireless communication systems where pilot signals are used for channel estimation, synchronization, and other essential functions. By combining orthogonal codes with scrambling sequences, the system achieves robust pilot signal mapping that minimizes interference and improves overall communication performance.
17. The apparatus of claim 13 , wherein a different modulated version of a same scrambling sequence is used for each antenna port.
This invention relates to wireless communication systems, specifically to techniques for improving signal transmission in multi-antenna configurations. The problem addressed is interference and signal degradation in systems where multiple antennas transmit the same data, leading to reduced performance and reliability. The apparatus includes a transmitter with multiple antenna ports, each configured to transmit a modulated version of a data signal. A scrambling sequence is applied to the data signal to reduce interference and improve signal distinguishability. A key feature is that each antenna port uses a different modulated version of the same scrambling sequence. This ensures that signals transmitted from different antennas are orthogonal or at least minimally interfering, enhancing signal quality and system capacity. The scrambling sequence may be generated using a pseudo-random or deterministic process, and the modulation applied to each version can vary in phase, amplitude, or other parameters to further optimize performance. The apparatus may also include error correction mechanisms and adaptive modulation schemes to further improve reliability. By using distinct modulated versions of the same scrambling sequence per antenna, the system achieves better signal separation and interference mitigation, particularly in dense deployment scenarios.
18. The apparatus of claim 13 , wherein the first input from the data symbols comprises forward error correction coded and modulated data bits.
A system for processing data symbols includes a receiver configured to obtain a first input comprising forward error correction (FEC) coded and modulated data bits. The system further includes a demodulator that extracts the modulated data bits from the first input and a decoder that decodes the FEC-coded data bits to correct errors introduced during transmission. The system may also include a second input for receiving additional data symbols, such as pilot or reference signals, to assist in demodulation and decoding. The apparatus may be part of a communication system, such as a wireless or wired network, where reliable data transmission is critical. The FEC coding ensures that errors can be detected and corrected, improving data integrity. The demodulation process converts the modulated signal back into a digital bitstream, which the decoder then processes to recover the original transmitted data. This system is particularly useful in environments with high noise or interference, where error correction is essential for maintaining data accuracy. The apparatus may also include synchronization mechanisms to align the received data symbols properly, ensuring accurate demodulation and decoding.
19. The apparatus of claim 13 , wherein the processor is further configured to map to shared time-frequency transmission resources being performed by different user equipment.
This invention relates to wireless communication systems, specifically to managing shared time-frequency transmission resources among multiple user equipment (UE) devices. The problem addressed is the efficient allocation and coordination of shared communication resources to avoid interference and optimize network performance. The apparatus includes a processor configured to allocate and manage shared time-frequency transmission resources. These resources are used by different UEs to transmit data simultaneously without causing interference. The processor ensures that the transmissions from multiple UEs are coordinated in both time and frequency domains, allowing for concurrent use of the same resources while maintaining signal integrity. The processor is further configured to map the shared time-frequency resources to the different UEs, ensuring that each UE is assigned a specific portion of the shared resources. This mapping process involves determining the optimal time slots and frequency bands for each UE based on factors such as signal strength, interference levels, and network load. The apparatus may also include a memory for storing resource allocation data and a transceiver for communicating with the UEs. The invention improves spectral efficiency by enabling multiple UEs to share the same time-frequency resources, reducing the need for dedicated resource allocation. This is particularly useful in dense wireless networks where resource contention is high. The apparatus can be implemented in base stations, access points, or other network infrastructure components to enhance communication efficiency and reliability.
Unknown
December 1, 2020
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